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E36 /7 Z3 (1996-2002)
E36/7 Z3 roadster and coupe talk with our gurus here.

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  #1  
Old 06-04-2011, 07:04 PM
TroyZ4 TroyZ4 is offline
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Mein Auto: 2006 Z4 3.0 M5
Unhappy Z4 Brake Pedal Hissing Noise

I have a 2003 BMW Z4 75K, it runs very nice. However, I have noticed when I come to a stop, I hear a hissing noise when I off the brake. If i keep my foot on the brake, it goes away. Please help me with the following questions:
  1. What is it?
  2. Can I just live with it?
  3. Is there a DYI Fix?
  4. Will it trigger a Code that would effect Inspection?
  5. How much should it cost to fix at a non dealdership?

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  #2  
Old 06-04-2011, 07:25 PM
Topcarbon Topcarbon is offline
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Mein Auto: Z4 coupe,GTi, 911 rsr
did you check for a snake?
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  #3  
Old 06-04-2011, 07:42 PM
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jayster0966 jayster0966 is offline
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Location: Orange County, CA
 
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Mein Auto: E24 E39 E83
If I am not mistaken your vehicle is equipped with a vacuum brake booster. There may be the beginning of a internal vacuum leak in the booster. If hissing sound comes and goes with the brake pedal being pressed and released then it is likely that the booster is starting to go bad. Eventually pedal will require more pressure to stop the vehicle and SES light may come on showing lean A/F mixture. Hope this helps.
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  #4  
Old 06-05-2011, 11:33 AM
TroyZ4 TroyZ4 is offline
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Exclamation Anyone else dealt with this issue???

Jayster,

That sounds about right. Would the light cause me to fail inspection in TX?

Anyone else please chime in. I just paid $1000 for a complete brake job and I don't want to be spending another $1000 on a vacuum brake booster (What an independent shop mentioned) It could be as easy as replacing a hose... Any DYI Options????
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  #5  
Old 06-05-2011, 01:10 PM
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jayster0966 jayster0966 is offline
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If the SES light comes on, it will fail any type of emission inspection in any state. I do not know the limit of your mechanical skills, but according to Alldata labor charts, you are looking at approx. 1.8 to 2.5 hours of labor. If you have it done at a independent shop, maybe you can use the above info to make sure that they do not charge some outragous labor times. Hope this helps.
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  #6  
Old 06-06-2011, 06:35 AM
TroyZ4 TroyZ4 is offline
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Great my SES Light Came on last night and won't turn off. Parts and Labor? I will call the Stealership to get the Max Quote then start with the Independents..
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  #7  
Old 06-07-2011, 07:36 AM
TroyZ4 TroyZ4 is offline
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Mein Auto: 2006 Z4 3.0 M5
Part New: 34336779681 BRAKE SERVO UNIT $420 (Can/Should I get it used)
Labor Stealship $500+ (They want to diagnose the problem for $150 to start)
Labor Ind Shop A $480
Labor Ind Shop B $200

Related thread http://www.bimmerfest.com/forums/sho...d.php?t=532371

Possible Cheap Solution under $50 http://forum.e46fanatics.com/showthread.php?t=703057

Last edited by TroyZ4; 06-07-2011 at 10:37 AM.
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  #8  
Old 06-07-2011, 08:46 AM
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jayster0966 jayster0966 is offline
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Price of the part sounds about right. Labor, in my opinion should fall anywhere between shop A and shop B. Based on labor times posted, shop B is closer to correct labor as I guess they charge approx. $100/hr. Labor for shop A sounds a little steep.

The cheap solution you mentioned, will work if it is the gasket or valve going bad. You can check that by spraying some carb cleaner around the gasket/valve and listening to see if engine rpm will change.

If the hissing sound is louder inside the vehicle than under the hood, then most likely booster will have to be changed. I work at a indy shop myself and it would not be the first tome the booster has gone bad in this type of vehicle.

Good luck.
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  #9  
Old 06-09-2011, 06:47 AM
TroyZ4 TroyZ4 is offline
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I ordered the parts for the Cheap fix at the Stealership. I will keep everyone posted if this works or not:
http://forum.e46fanatics.com/showthread.php?t=703057

Parts 4 and 5...
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  #10  
Old 06-22-2011, 08:44 AM
TroyZ4 TroyZ4 is offline
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The fix didn't work. Clearly its the Brake Booster leaking. It was a good try.
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